feat: add LLM module exports

packages/llm/src/index.ts

@@ -0,0 +1,4 @@
+export { createProvider } from "./providers/factory.js";
+export { generateDocumentation } from "./pipeline.js";
+export { chunkCode, extractSignatures } from "./chunker.js";
+export type { LLMProvider } from "./providers/base.js";